tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.10 head: bf98c1493fb23bfd7e2678498b7e337ce2cd1d53 commit: e6de170decc96254704d77b4726ad658c6a2f42c [625/1760] OF: DT-Overlay configfs interface (v8) config: s390-randconfig-r011-20210812 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 767496d19cb9a1fbba57ff08095faa161998ee36) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://github.com/Xilinx/linux-xlnx/commit/e6de170decc96254704d77b4726ad... git remote add xlnx https://github.com/Xilinx/linux-xlnx git fetch --no-tags xlnx xlnx_rebase_v5.10 git checkout e6de170decc96254704d77b4726ad658c6a2f42c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): ssize_t cfs_overlay_item_dtbo_read(struct config_item *item, ^ drivers/of/configfs.c:134:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ssize_t cfs_overlay_item_dtbo_read(struct config_item *item, ^ static ssize_t cfs_overlay_item_dtbo_write(struct config_item *item, ^ drivers/of/configfs.c:156:1: note: declare 'static' if the function is not intended to be used outside of this translation unit ssize_t cfs_overlay_item_dtbo_write(struct config_item *item, ^ static 2 warnings generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for MFD_SUN6I_PRCM Depends on HAS_IOMEM && (ARCH_SUNXI || COMPILE_TEST Selected by - CLK_SUNXI_PRCM_SUN6I && COMMON_CLK && CLK_SUNXI - CLK_SUNXI_PRCM_SUN8I && COMMON_CLK && CLK_SUNXI vim +/cfs_overlay_item_dtbo_read +134 drivers/of/configfs.c 133 135 void *buf, size_t max_count) 136 { 137 struct cfs_overlay_item *overlay = to_cfs_overlay_item(item); 138 139 pr_debug("%s: buf=%p max_count=%zu\n", __func__, buf, max_count); 140 141 if (!overlay->dtbo) 142 return 0; 143 144 /* copy if buffer provided */ 145 if (buf) { 146 /* the buffer must be large enough */ 147 if (overlay->dtbo_size > max_count) 148 return -ENOSPC; 149 150 memcpy(buf, overlay->dtbo, overlay->dtbo_size); 151 } 152 153 return overlay->dtbo_size; 154 } 155 157 const void *buf, size_t count) 158 { 159 struct cfs_overlay_item *overlay = to_cfs_overlay_item(item); 160 int err; 161 162 /* if it's set do not allow changes */ 163 if (overlay->path[0] != '\0' || overlay->dtbo_size > 0) 164 return -EPERM; 165 166 /* copy the contents */ 167 overlay->dtbo = kmemdup(buf, count, GFP_KERNEL); 168 if (!overlay->dtbo) 169 return -ENOMEM; 170 171 overlay->dtbo_size = count; 172 173 err = create_overlay(overlay, overlay->dtbo); 174 if (err < 0) 175 goto out_err; 176 177 return count; 178 179 out_err: 180 kfree(overlay->dtbo); 181 overlay->dtbo = NULL; 182 overlay->dtbo_size = 0; 183 184 return err; 185 } 186 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org